Acute myeloid leukemia (also called AML) is a cancer of the blood and bone marrow cells. It affects a group of white blood cells called myeloid cells because they are formed in the bone marrow. "Acute" means that it develops and advances quickly, and requires immediate treatment.

Mononucleosis is a viral infection that is mainly spread through contact with the saliva of an infected person. It is not a serious illness and most people who get it will develop antibodies, giving them lifelong immunity.